knock at the door before entering please句中只有KNOCK AT 一个动词?enter为什么不是?
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knock at the door before entering please句中只有KNOCK AT 一个动词?enter为什么不是?
before entering(进门之前)是修饰knock at the door(敲门)的从句.enter本身是动词没错,但是它在从句里,并不是整个句子的主干.
分开来看就是:
主干:(祈使句)knock at the door
修饰1:(什么时候敲门?)before entering
修饰2:(礼貌语气)please
knock at the door造句
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